ZT 1.8T - turbo fault at 4000rpm

MartinW · 4th June 2007, 19:23

Another MGOC member that I have suggested should join here, but in the meantime, any help/ideas?

Quote:

Evening gentleman have recently purchased a 2004 zt turbo thats done 48000 miles am very pleased with it but it seems to have an intermittent problem with the turbo if i drive it sensibly it will use all the rev range , but when i need the turbo for overtaking and once the revs get to 4000revs the turbo cuts in and cuts straight out ive checked turbo pipes and vacuum pipes but to no avail does it have a rev limiter your help is greatly appreciated

JohnDotCom · 4th June 2007, 22:55

Martin, If thats the CDTi Diesel Turbo it sounds like a possible problem with Maf rather than just Turbo, as this causes all sorts of problems and doesn't like going to High Revs. No rev Limiter fitted, as I've gone all the way round for a few moments once! The Turbo comes in a lot lower revs than that more around 1800RPM I believe.
Most probally completely off track and should wait for someone to come along with knowledge on Turbo Problems and Cures.
I do hope it isnt a Faulty Turbo...........Not Cheap!

MartinW · 5th June 2007, 07:57

John
Thanks for the reply, but no, it's the 1.8Turbo petrol.

JohnDotCom · 5th June 2007, 10:34

Thanks for the Clarification Martin.
Over to you petrol Chaps to help Martin please.

MartinW · 5th June 2007, 10:46

The gentleman asking the question has joined, so hopefully he will spot the thread.

PS, John, the clue was in the title! I should have mentioned it in the txt, too, though. But thanks for taking the time to post, much appreciated.

JohnDotCom · 5th June 2007, 10:54

Yes I completely missed that late last night

went into a completely Parallel Planet with that, sorry, I just read the Quote bit.

ladwa · 5th June 2007, 16:49

Guess what!

My 1.8t does exactly the same thing!

The VAC leads have been changed, which did not cure the problem. Looks like it could be the boost control valve that is playing up, but at £60ish its an expensive gamble.

Other usual suspects are plugs, coils, ignition leads.

MartinW · 6th June 2007, 08:12

Thanks for the input, ladwa. Hopefully antgibbons will have seen this thread by now.

antgibbons · 6th June 2007, 09:30

Good morning gentleman a big thank you to martin w for the link to this forum , and a big thank you to all the replys that have been posted, i will certainly try the boost control valve and let you guys know the outcome , many thanks again

Kind Regards

Tony Gibbons
Oxford

MGOracle · 6th June 2007, 11:53

sounds to me like the BCV and its soft cutting the boost for some reasona or another. Sticking valve?

Replace it, see how you go

6th June 2007, 09:30	#9
antgibbons Newbie Join Date: Jun 2007 Posts: 3 Thanks: 0 Thanked 0 Times in 0 Posts	ZT 1.8t Good morning gentleman a big thank you to martin w for the link to this forum , and a big thank you to all the replys that have been posted, i will certainly try the boost control valve and let you guys know the outcome , many thanks again Kind Regards Tony Gibbons Oxford

4th June 2007, 22:55	#2
JohnDotCom * Rover 75 FaceLift Tourer CDTi 170BHP Auto ConnSE 2005 Model Starlight Silver Join Date: Nov 2006 Location: Abergele Posts: 28,735 Thanks: 0 Thanked 6 Times in 5 Posts	Martin, If thats the CDTi Diesel Turbo it sounds like a possible problem with Maf rather than just Turbo, as this causes all sorts of problems and doesn't like going to High Revs. No rev Limiter fitted, as I've gone all the way round for a few moments once! The Turbo comes in a lot lower revs than that more around 1800RPM I believe. Most probally completely off track and should wait for someone to come along with knowledge on Turbo Problems and Cures. I do hope it isnt a Faulty Turbo...........Not Cheap!

5th June 2007, 07:57	#3
MartinW Newbie MG TF LE500 Join Date: Nov 2006 Location: Chester Posts: 2 Thanks: 0 Thanked 2 Times in 2 Posts	John Thanks for the reply, but no, it's the 1.8Turbo petrol.

5th June 2007, 10:34	#4
JohnDotCom * Rover 75 FaceLift Tourer CDTi 170BHP Auto ConnSE 2005 Model Starlight Silver Join Date: Nov 2006 Location: Abergele Posts: 28,735 Thanks: 0 Thanked 6 Times in 5 Posts	Thanks for the Clarification Martin. Over to you petrol Chaps to help Martin please.

5th June 2007, 10:46	#5
MartinW Newbie MG TF LE500 Join Date: Nov 2006 Location: Chester Posts: 2 Thanks: 0 Thanked 2 Times in 2 Posts	The gentleman asking the question has joined, so hopefully he will spot the thread. PS, John, the clue was in the title! I should have mentioned it in the txt, too, though. But thanks for taking the time to post, much appreciated.

5th June 2007, 10:54	#6
JohnDotCom * Rover 75 FaceLift Tourer CDTi 170BHP Auto ConnSE 2005 Model Starlight Silver Join Date: Nov 2006 Location: Abergele Posts: 28,735 Thanks: 0 Thanked 6 Times in 5 Posts	Yes I completely missed that late last night went into a completely Parallel Planet with that, sorry, I just read the Quote bit.

5th June 2007, 16:49	#7
ladwa Newbie C350 Sports Coupe Join Date: Nov 2006 Location: Milton Keynes Posts: 28 Thanks: 0 Thanked 0 Times in 0 Posts	Guess what! My 1.8t does exactly the same thing! The VAC leads have been changed, which did not cure the problem. Looks like it could be the boost control valve that is playing up, but at £60ish its an expensive gamble. Other usual suspects are plugs, coils, ignition leads.

6th June 2007, 08:12	#8
MartinW Newbie MG TF LE500 Join Date: Nov 2006 Location: Chester Posts: 2 Thanks: 0 Thanked 2 Times in 2 Posts	Thanks for the input, ladwa. Hopefully antgibbons will have seen this thread by now.

6th June 2007, 11:53	#10
MGOracle Banned MG ZT CDTi 135+ Join Date: Mar 2007 Location: Cardiff Posts: 1 Thanks: 0 Thanked 5 Times in 2 Posts	sounds to me like the BCV and its soft cutting the boost for some reasona or another. Sticking valve? Replace it, see how you go